One component polyurethane dispersion for vinyl windows and other substrates

Abstract

The present invention provides an aqueous polyurethane dispersion (PUD) comprising an amorphous polyester having a glass transition temperature (Tg) as determined by differential scanning calorimetry of less than −30° C.; wherein the aqueous polyurethane dispersion (PUD) has a glass transition temperature (Tg) as determined by differential scanning calorimetry (DSC) of 0° C. to 20° C. and a hard block content of greater than 50%. Coatings, adhesives, sealants, paints, primers and topcoats, made from the inventive aqueous polyurethane dispersion (PUD) pass detergent resistance testing according to the American Architectural Manufacturers Association's standard, AAMA 615-13, have a pencil hardness according to ASTM D3363 of at least 3H, and are particularly suited for use on low surface energy substrates such as vinyl and other surfaces including floors, windows, doors, window frames, door frames, window shutters, railing, gates, pillars, arbors, pergolas, trellises, gazebos, posts, fencing, pipes and fittings, wire and cable insulation, automobile components, credit cards, and siding.

What is claimed is: 
     
         1 . A primer containing an aqueous polyurethane dispersion (PUD) comprising the reaction product of:
 (i) a polyisocyanate;   (ii) a polymeric polyol having a number average molecular weight of 400 to 8,000 g/mol;   (iii) a compound comprising at least one isocyanate-reactive group and an anionic group or potentially anionic group;   (iv) an amorphous polyester having a glass transition temperature (Tg) as determined by differential scanning calorimetry (DSC) of less than −30° C.;   (v) water;   (vi) a mono functional polyalkylene ether;   (vii) a polyol having a molecular weight of less than <400 g/mol, and   (viii) a polyamine or amino alcohol having a molecular weight of 32 to 400 g/mol,   wherein the aqueous polyurethane dispersion (PUD) has a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of 0° C. to 20° C. and a hard block content of greater than 50%.   
     
     
         2 . The primer according to  claim 1 , wherein the amorphous polyester (iv) comprises ortho-phthalic anhydride. 
     
     
         3 . The primer according to  claim 1 , wherein the PUD contains n-methyl-2-pyrrolidone (NMP). 
     
     
         4 . The primer according to  claim 1 , wherein the PUD is substantially free of n-methyl-2-pyrrolidone (NMP). 
     
     
         5 . A substrate have applied thereto the primer according to  claim 1 . 
     
     
         6 . The substrate according to  claim 5 , wherein the amorphous polyester (iv) comprises ortho-phthalic anhydride. 
     
     
         7 . The substrate according to  claim 5 , wherein the PUD contains n-methyl-2-pyrrolidone (NMP). 
     
     
         8 . The substrate according to  claim 5 , wherein the PUD is substantially free of n-methyl-2-pyrrolidone (NMP). 
     
     
         9 . The substrate according to  claim 5 , wherein the substrate is selected from the group consisting of wood, polyvinylchloride, polyamide (PA), polyethylene (PE), high-density polyethylene (HDPE), low-density polyethylene (LDPE), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyester (PES), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polyurethane (PU), thermoplastic polyurethane, epoxy, polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polycarbonate/acrylonitrile butadiene styrene (PC/ABS), polyethylene/acrylonitrile butadiene styrene (PE/ABS), polymethyl methacrylate (PMMA), polybenzimidazole (PBI), polyoxymethylene (POM), concrete, masonry, textiles, metals, ceramics, composites, and glass. 
     
     
         10 . The substrate according to  claim 5 , wherein the substrate is selected from the group consisting of floors, windows, doors, window frames, window surrounds, door frames, window shutters, railing, gates, pillars, arbors, pergolas, trellises, gazebos, posts, fencing, pipes and fittings, wire and cable insulation, automobile components, cladding and siding. 
     
     
         11 . The substrate according to  claim 5 , wherein the substrate is selected from the group consisting of untreated cold rolled steel, zinc phosphate treated steel, iron phosphate treated steel, untreated milled aluminum, chromium treated aluminum, and zinc hot dip galvanized unexposed steel. 
     
     
         12 . The substrate according to  claim 11 , wherein the primer has an adhesion measured according to ASTM D3359 of 5B. 
     
     
         13 . A topcoat containing an aqueous polyurethane dispersion (PUD) comprising the reaction product of:
 (i) a polyisocyanate;   (ii) a polymeric polyol having a number average molecular weight of 400 to 8,000 g/mol;   (iii) a compound comprising at least one isocyanate-reactive group and an anionic group or potentially anionic group;   (iv) an amorphous polyester having a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of less than −30° C.;   (v) water;   (vi) a mono functional polyalkylene ether;   (vii) a polyol having a molecular weight of less than <400 g/mol, and   (viii) a polyamine or amino alcohol having a molecular weight of 32 to 400 g/mol,   wherein the aqueous polyurethane dispersion (PUD) has a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of 0° C. to 20° C. and a hard block content of greater than 50%.   
     
     
         14 . The topcoat according to  claim 13 , wherein the amorphous polyester (iv) comprises ortho-phthalic anhydride. 
     
     
         15 . The topcoat according to  claim 13 , wherein the PUD contains n-methyl-2-pyrrolidone (NMP). 
     
     
         16 . A substrate have applied thereto the topcoat according to  claim 13 . 
     
     
         17 . The substrate according to  claim 16 , wherein the amorphous polyester (iv) comprises ortho-phthalic anhydride. 
     
     
         18 . The substrate according to  claim 16 , wherein the PUD contains n-methyl-2-pyrrolidone (NMP). 
     
     
         19 . The substrate according to  claim 16 , wherein the PUD is substantially free of n-methyl-2-pyrrolidone (NMP). 
     
     
         20 . The substrate according to  claim 16 , wherein the substrate is selected from the group consisting of wood, polyvinylchloride, polyamide (PA), polyethylene (PE), high-density polyethylene (HDPE), low-density polyethylene (LDPE), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyester (PES), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polyurethane (PU), thermoplastic polyurethane, epoxy, polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polycarbonate/acrylonitrile butadiene styrene (PC/ABS), polyethylene/acrylonitrile butadiene styrene (PE/ABS), polymethyl methacrylate (PMMA), polybenzimidazole (PBI), polyoxymethylene (POM), concrete, masonry, textiles, metals, ceramics, composites, and glass. 
     
     
         21 . The substrate according to  claim 16 , wherein the substrate is selected from the group consisting of floors, windows, doors, window frames, window surrounds, door frames, window shutters, railing, gates, pillars, arbors, pergolas, trellises, gazebos, posts, fencing, pipes and fittings, wire and cable insulation, automobile components, cladding and siding.